Roger replaces the existing concrete front walk with a beautiful new bluestone design. Tom shows Kevin the modifications he specified on the replacement windows. On the third floor, tile contractor Mark Ferrante uses a shower waterproofing system. Architect Michael Kim shows Kevin how he planned a modern house inside the shell of an old one in Brookline, Massachusetts. Painting contractor Mauro Henrique starts paint prep and shows Kevin the shades of yellow the homeowner is considering for the exterior. In the second half of the hour, on ASK THIS OLD HOUSE, Richard heads to Colorado Springs, Colorado, to install a new kitchen sink and faucet. Then, Tom installs insulated sidelights on a front door.